His voice. Perfect as a kid, and even teenager at 15... but... when he's 16 and 18.. I think he should be getting a more male like voice. Kinda more deepened a little bit. But thats just my view. Not that its terrible but i think it would be better.

Kinda like Ocarina of Time with Link, as a kid perfect, as Adult excellent!!

I was expecting this to say those filler arcs, but it turns out to be about Naruto Uzumaki himself and the voice of the knucklehead ninja, not the show that has been going on and on, and coming to a point where Pierrot is doing nothing but milking a cash cow even though the manga has since ended. There are quite a number of flaws that this show has, but none more so than the filler material that is unnecessary and adds absolutely nothing.